I've been playing Hampton Hawes and his amazing piano trio and quartet jams most of the day, outside.
The B channel on one of my outdoor system's amps blew.

I opened it up and found an exploded coupling cap on the output end. I hope it didn't take any of those expensive old Motorola MOSFETs with it.

So, now, I'm no longer tri-amped out there. I am bi-amped. Still, it's about a hundred times the watts that I need. I'll survive.